Date: Sun, 29 Apr 2018 06:45:39 +0400 From: Igor Stoppa <igor.stoppa@...il.com> To: mhocko@...nel.org, akpm@...ux-foundation.org, keescook@...omium.org, linux-mm@...ck.org, kernel-hardening@...ts.openwall.com, linux-security-module@...r.kernel.org Cc: willy@...radead.org, labbott@...hat.com, linux-kernel@...r.kernel.org, igor.stoppa@...wei.com Subject: [PATCH 0/3] linux-next: mm: hardening: Track genalloc allocations This patchset was created as part of an older version of pmalloc, however it has value per-se, as it hardens the memory management for the generic allocator genalloc. Genalloc does not currently track the size of the allocations it hands out. Either by mistake, or due to an attack, it is possible that more memory than what was initially allocated is freed, leaving behind dangling pointers, ready for an use-after-free attack. With this patch, genalloc becomes capable of tracking the size of each allocation it has handed out, when it's time to free it. It can either verify that the size received, when free is invoked, is correct, or it can decide autonomously how much memory to free, if the value received for the size parameter is 0. These patches are proposed for beign merged into linux-next, to verify that they do not introduce regressions, by comparing the value received from the callers of the free function with the internal tracking. Later on, the "size" parameter can be dropped, and each caller can be adjusted accordingly. Signed-off-by: Igor Stoppa <igor.stoppa@...wei.com> Igor Stoppa (3): genalloc: track beginning of allocations Add label and license to genalloc.rst genalloc: selftest Documentation/core-api/genalloc.rst | 4 + include/linux/genalloc.h | 112 +++--- init/main.c | 2 + lib/Kconfig | 15 + lib/Makefile | 1 + lib/genalloc.c | 742 ++++++++++++++++++++++++++---------- lib/test_genalloc.c | 410 ++++++++++++++++++++ 7 files changed, 1031 insertions(+), 255 deletions(-) create mode 100644 lib/test_genalloc.c -- 2.14.1
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.